Safety control means with flash tube for oven burners



Aug. 29, 1950 INVENTOR. WILL/AM 0. A/vre/M BY Arrm/vEy D. ANTRIM W.SAFETY CONTROL MEANS WITH FLASH TUBE FOR OVEN BURNERS Filed Feb. 1, 1946Patented Aug. 29, 1950 SAFETY CONTROL MEANS WITH FLASH TUBE FOR OVENBURNERS William D. Antrim, Cleveland, Ohio, assignor, by

mesnc assignments, to Aiiiliated Gas Equipment, Inc., Cleveland, Ohio, acorporation of Delaware Application February 1, 1946, Serial No. 644,887

2 Claims.

This invention relates to automatic ignition and safety devices for, gasburners, and is particularly adapted for application to the oven burnerof a gas cooking range wherein a constantly burning pilot, such as theusual top burner pilot, is available for ignition of the safety pilotwhich immediately serves the oven burner, by way of flash tube meanseffective to be energized by the safety pilot for ignition thereof fromthe constant pilot.

Objects of the invention are to so relate such flash pilot burner withother parts of the range and particularly the gas circuits thereof, thatautomatic control of the flash pilot burner results, to effecteconomical and otherwise improved operation thereof as will appear; theimproved arrangement also providing lower gas consumption of the safetypilot burner, also as will appear.

Another object is to accomplish these ends by much simpler means thanhave heretofore been considered necessary in the art.

Further objects and advantages will be apparent from the followingdescription taken in connection with the accompanying drawing, which isa diagrammatic and conventionalized view showing pertinent parts of agas range, and the interrelation of such parts, illustrative of theinvention.

With reference now to the drawing: l is the gas supply pipe, which maybe the usual manifold from which the various range burners such as topburners, not illustrated, have connection subject to their usualindividual control valves.

2 is a main burner located within the oven of the range as indicated bythe broken line 3.

The burner 2 has a gas supply line as indicated and including the manualvalve 4, thermostatic valve 5 and automatic safety shut-off valve.

6 arranged to be sequentially effective in the line from the manifold Ito the burner 2 as is usual and well known in the art.

The thermostatic valve 5 is a throttling valve responsive to a thermalelement 1 within the oven 3 and has the usual associated by-pass 8 bywhich provision is made for low limit flow independent of the thermalelement 1.

The safety valve 6 is arranged to be responsive to safety pilot burnermeans generally indicated at 9, by means the details of which are nothere material; it being suflicient to here state that the pilot burnermeans 9 includes provision for a flame portion 9a in igniting relationwith the burner 2, a flame 9b whose purpose will hereinafter appear, anda flame portion to which the valve 6 is subject, as through a thermallyresponsive element Sci-it being understood that so far as this inventionis concerned the described flame portions of the pilot burner means 9act as a single flame in that they are in constantly igniting relationwith each other.

This pilot burner means 9 has gas supply as thru a line l0 subject tothe operator-controlled valve means 4, and ahead of or otherwiseindependent of the thermostatic valve means 5 as well as the safetyvalve 6.

A constantly burning pilot burner H which may be located above the levelof the oven burner 2 to be employed for ignition of the range topburners, is served from the manifold I.

According to this invention I employ the following means providingautomatic ignition for the safety pilot burner 9 from the constant pilotburner II' as follows:

A flash tube I2 is disposed to lead generally between the constant pilotburner H and the safety pilot 9 with ends thereadiacent, and a flashpilot burner I3 is associated with the flash tube l2 intermediate itsends; the flash tube if having a rising portion indicated with a bottomopening adjacent the flash pilot and a sloping portion I2a. arranged toreceive gas charge from the pilot burner 9b and have ignition from thepilot burner I3. The arrangement is such that when gas is admitted toboth the safety pilot burner 9 and the flash pilot burner l3, the flashpilot will have ignition from the constant pilot burner H by way of theintervening portion of the flash tube 12; and the portion 9b of thesafety pilot burner, and therefore the safety pilot burner as a whole,will have ignition from the flash pilot burner [3 by way of theintermediate portion-of the flash tube I2.-

The flash pilot burner l3 has its gas supply as indicated in thedrawing, effectively ahead of the safety valve 6 but after and thereforesubject to the manual valve 4 and the thermostatic ,v'alve 5.

Operation will be as follows, commencing with the oven burner out butthe constant pilot ll operating. Under these conditions the manual valve4 is closed, the thermally responsive valve 5 is open, the safety valve6 is closed and the flash pilot burner l3 and safety pilot burner 9 notoperating.

To start the oven burner 2 the operator opens the manual valve 4. Thisadmits gas to the safety valve 6 and flash pilot burner 13 by Way of thethermostatic valve 5, and admits gas to the safety pilot burner 9 by wayof the line [0, such gas being at substantially full line pressure.

The gas emerging from the flash pilot burner l3 and at the part 81) ofthe safety pilot burner charges the entire flash tube I2 to provideignition of the flash pilot burner from the constant pilot burner Ii,and ignition of the safety pilot burner from the flash pilot burner.Ignition of the safety pilot burner 9 causes opening of the safety valve6 to admit gas to the main burner 2 which is ignitedby the safety pilotburner part 9a. After the oven is heated up by the main burner 2, thethermal element 1 causes the thermostatic valve to throttle down, itbeing understood that the throttling action of the thermostatic valve isa function of the presetting of the valve by the operator to the desiredoven temperature. Such throttling is effective upon the flash pilotburner [3 as well as the main burner 2; but it is not effective upon thesafety pilot burner 9 which therefore may be set for a lower rate ofconsumption than would otherwise be the case.

In case of safety pilot burner outage during oven operation, the safetyvalve 5 automatically closes to cut off gas from the main burner 2,closing of the safety valve builds up pressure to increase the gas atthe flash pilot burner l3 so that a relight of the safety pilot burner 8automatically occurs, after which the oven burner automatically comes onagain.

When the desired oven operation is completed, turning off of the manualvalve 4 outs gas off from all of the outlets described with theexception of the constant burning pilot burner II.

I claim:

1. In a gas range having an oven with a main burner therein, a constantpilot burner located outside said oven, a safety pilot burner arrangedin igniting relation to said main burner, a gas supply line for saidmain burner including, in sequential arrangement leading thereto,operator-controlled valve means, thermostatic valve means responsive totemperature in said oven, and safety shut-off valve means responsive tosaid safety pilot burner, and gas supply means for said safety pilotburner leading from said supply line after said operator-controlledvalve means and ahead of said thermostatic valve means: means providingautomatic ignition for said safety pilot burner from said constant pilotburner, and including flash tube means having an end adjacent saidconstant pilot burner to receive ignition therefrom, an end adjacentsaid safety pilot burner to receive gas therefrom, and an intermediateopening, a flash pilot burner associated with said opening to receiveignition from said top pilot burner and rovide ignition for said safetypilot burner, and a connection providing gas supply for said flash pilotburner means leading from said line after said thermostatic valve meansand ahead of said safety valve means.

2. In a gas range having an oven with a main burner therein, a constantpilot burner located outside said oven and higher than said main burner,a safety pilot burner arranged in igniting relation to said main burner,a gas supply line for said main burner including, in sequentialarrangement leading thereto, operator-controlled valve means,thermostatic valve means responsive to temperature in said oven, andsafety shut-off valve means responsive to said safety pilot burner, andgas supply means for said safety pilot burner leading from said supplyline after said operator-controlled valve means and ahead of saidthermostatic valve means: means providing automatic ignition for saidsafety pilot burner from said constant pilot burner, and including aflash pilot burner at a location substantially lower than said constantpilot burner, flash tube means having an end adjacent said safety pilotburner to receive gas therefrom, and an end adjacent said flash pilotburner for ignition of said safety pilot burner thereby, said flash tubemeans also including a rising portion having a lower end arranged toreceive gas from said flash pilot means and an upper opening forignition of said flash pilot burner by said top pilot burner, and aconnection providing gas supply for said flash pilot burner means,leading from said line after said thermostatic valve means and ahead ofsaid safety valve means.

WILLIAM D. ANTRIM.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,971,704 Castonguay Aug. 28,1934 2,063,834 Bast et a1 Dec. 8, 1936 2,072,034 Geurink et al Feb. 23,1937 2,072,552 Gauger Mar. 2, 1937 2,082,296 Methudy June 1, 19372,087,433 Hollman July 20, 1937 2,490,729 Craver et al Dec. 6, 1949FOREIGN PATENTS Number Country Date 827,388 France Apr. 25, 1938

